CN201523320U - Slow start device of direct current power supply - Google Patents
Slow start device of direct current power supply Download PDFInfo
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- CN201523320U CN201523320U CN2009201328041U CN200920132804U CN201523320U CN 201523320 U CN201523320 U CN 201523320U CN 2009201328041 U CN2009201328041 U CN 2009201328041U CN 200920132804 U CN200920132804 U CN 200920132804U CN 201523320 U CN201523320 U CN 201523320U
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Abstract
The utility model discloses a slow start device of a direct current power supply. The slow start device comprises a slow start capacitor and a power-off recovery module, wherein the power-off recovery module comprises a switch connected with the slow start capacitor in parallel and a switch control circuit used for detecting a power supply, when the value of the power supply is lower than a threshold value, the switch is controlled to close, and when the value of the power supply is higher than the threshold value, the switch is controlled to open. Through the addition of the power-off recovery module, the utility model can lead the slow start device to have quick recovery function when the power down of the power supply happens, and the problem that the slow start device cannot be powered up quickly when the power supply is powered down and quickly powered up is overcome.
Description
Technical field
The utility model relates to the DC power supply field, especially relates to a kind of relaxed starter with DC power supply of quick restore funcitons.
Background technology
In present electronic product, power supply is a vital part in the Circuits System.In the process that Circuits System powers on, because the surge current that capacitive load causes is easy to damage electronic device, so industry is being studied always, and power supply is slow to be started or the linear method that starts.
At present, the design of relaxed starter is not very perfect, and relaxed starter only satisfies when powering on the soft start function to power supply, when power supply power-fail again during fast powering-up, the capacitance charge bleed off is incomplete, and soft start function lost efficacy, and surge current causes the damage and the fault of back Circuits System easily.
The utility model content
Technical problem to be solved in the utility model is, a kind of relaxed starter of DC power supply is provided, and overcome power supply power-fail again during fast powering-up, the problem that relaxed starter can not normal power-up.
For solving the problems of the technologies described above, the utility model proposes a kind of relaxed starter of DC power supply, comprising: slow electric capacity and the power interruption recovering module of starting;
Described power interruption recovering module comprises switch and ON-OFF control circuit;
Described switch is in parallel with described slow startup electric capacity;
Described ON-OFF control circuit is used to detect power supply, when the value of described power supply is lower than threshold value, controls described switch closure, when the value of described power supply is higher than threshold value, controls described switch and disconnects.
Further, described switch is a relay; Described ON-OFF control circuit comprises ADC and MCU;
Described ADC is used for the analogue value of power supply is converted to digital value, and transformation result is sent into described MCU;
Described MCU is used to detect the digital value of described power supply, when the digital value of described power supply is lower than threshold value, controls described relay closes, when the digital value of described power supply is higher than threshold value, controls described relay and disconnects.
Further, described power supply is a positive supply; Described relaxed starter also comprises: PMOS switch, first resistance and second resistance;
Described PMOS switch is serially connected on the positive supply;
Described first resistance and second resistance are serially connected, the control end of the described PMOS switch of public termination, another termination positive supply of first resistance, the other end ground connection of second resistance;
Described slow startup electric capacity is connected between the control end and input of PMOS switch.
Further, described power supply is a negative supply; Described relaxed starter also comprises: nmos switch, first resistance and second resistance;
Described nmos switch is serially connected on the negative supply;
Described first resistance and second resistance are serially connected, the control end of the described nmos switch of public termination, another termination negative supply of first resistance, the other end ground connection of second resistance;
Described slow startup electric capacity is connected between the control end and input of nmos switch.
Further, described PMOS switch can replace with the PNP-BJT switch; Described nmos switch can replace with the NPN-BJT switch.
Further, described switch is an analog switch; Described ON-OFF control circuit comprises first resistance and second resistance;
Described analog switch, in parallel with described slow startup electric capacity;
Described first resistance and second resistance are serially connected, the control end of the described analog switch of public termination, another termination power of first resistance, the other end ground connection of second resistance.
Further, described analog switch is the PNP-BJT switch.
Further, described power supply is a positive supply; Described relaxed starter also comprises: PMOS switch, NPN-BJT switch, the 3rd resistance, the 4th resistance, the 5th resistance and the 6th resistance;
Described PMOS switch is serially connected on the positive supply;
Described the 3rd resistance, the 4th resistance and NPN-BJT switch, order is serially connected the control end of the described PMOS switch of public termination of resistance, another termination positive supply of the 3rd resistance, the output head grounding of NPN-BJT switch;
Described the 5th resistance and the 6th resistance are serially connected, the control end of the described NPN-BJT switch of public termination, another termination positive supply of the 5th resistance, the other end ground connection of the 6th resistance;
Described slow startup electric capacity, in parallel with described the 6th resistance.
Further, described power supply is a negative supply; Described relaxed starter also comprises: nmos switch, the 3rd resistance and the 4th resistance;
Described nmos switch is serially connected on the negative supply;
Described the 3rd resistance and the 4th resistance are serially connected, the control end of the described nmos switch of public termination, another termination negative supply of the 3rd resistance, the other end ground connection of the 4th resistance;
Described slow startup electric capacity is connected between the control end and input of nmos switch.
Further, the switch of the switch of described NPN-BJT type and NMOS type is interchangeable; The switch of the switch of described PNP-BJT type and PMOS type is interchangeable.
The utility model provides a kind of relaxed starter of DC power supply, by increasing the power interruption recovering module, make relaxed starter when power supply power-fail, have quick restore funcitons, overcome power supply power-fail again during fast powering-up, the problem that relaxed starter can not normal power-up.
Description of drawings
Fig. 1 adopts relay to constitute the positive supply relaxed starter structure chart of bleed-off circuit;
Fig. 2 adopts relay to constitute the negative supply relaxed starter structure chart of bleed-off circuit;
Fig. 3 adopts analog switch to constitute the positive supply relaxed starter structure chart of bleed-off circuit;
Fig. 4 adopts analog switch to constitute the negative supply relaxed starter structure chart of bleed-off circuit.
Specific embodiment
Below in conjunction with specific embodiments and the drawings the utility model is elaborated:
Embodiment one
Referring to Fig. 1, input is a positive supply, relaxed starter comprises in the prior art: PMOS (P-channelMetal Oxide Semiconductor, P-channel metal-oxide-semiconductor field-effect transistor) switch T1, slow capacitor C 1, first resistance R 1 and second resistance R 2 of starting;
Described PMOS switch T1 is serially connected on the positive supply;
Described first resistance R 1 and second resistance R 2 are serially connected, the control end of the described PMOS switch of public termination T1, another termination positive supply of first resistance R 1, the other end ground connection of second resistance R 2;
Described slow startup capacitor C 1 is connected between the control end and input of PMOS switch T1, also is between the grid and source electrode of PMOS.
When positive supply powered on, the slow electric capacity both end voltage Vc that starts slowly rose, as Vc during greater than the threshold voltage vt of PMOS, and PMOS switch T1 closure.
When positive supply was stablized, the voltage of first resistance R 1 and second resistance R, 2 common ports had determined the voltage of PMOS switch T1 control end.
In such scheme, during the positive supply power down, because the slow electric capacity both end voltage that starts can not be suddenlyd change, PMOS switch T1 still is in closure state, so power supply output may cause the working state abnormal of subordinate equipment, and the capacitance charge bleed off is when incomplete, if positive supply powers on very soon, soft start function lost efficacy, and surge current causes the damage and the fault of back Circuits System easily like this.
In order to make the slow electric capacity that starts can repid discharge, relaxed starter described in the utility model also comprises: relay, ADC (Analog to Digital Converter, analog to digital converter) and MCU (Micro-ControllerUnit, micro controller unit);
Described relay, in parallel with described slow startup electric capacity;
Described ADC is used for the analogue value of power supply is converted to digital value, and transformation result is sent into described MCU;
Described MCU is used to detect the digital value of described power supply, when the digital value of described power supply is lower than threshold value, controls described relay closes, when the digital value of described power supply is higher than threshold value, controls described relay and disconnects.
MCU has the characteristics of digitlization and intelligence, and this threshold value can be by the setting of software flexible, and MCU adopts independently power supply power supply, not influenced by the positive supply power or power-down, but operate as normal.
When the positive supply power down, MCU detects the voltage difference on positive supply and ground when being lower than threshold value, control described relay closes, slow startup electric capacity shorted on both ends together, the slow electric charge that starts on the electric capacity can be fallen by quick bleed off, if think that the short circuit meeting causes electric current excessive, can on the bleed off loop, place a current-limiting resistance.
When positive supply powered on, MCU detected the voltage difference on positive supply and ground when being higher than threshold value, controls described relay and disconnects, and the slow voltage difference that starts on the electric capacity just can slowly rise just conducting gradually of PMOS switch T1.When the starting stage of power supply electrifying, to be positive supply with the voltage difference on ground be lower than threshold value, the low relay of supply voltage can be closed always, the slow electric capacity that starts is in short-circuit condition always, and PMOS switch T1 can conducting, can prevent that so less voltage is delivered to power supply output.
Embodiment two
Referring to Fig. 2, input is a negative supply, and relaxed starter comprises in the prior art: NMOS (N-channelMetal Oxide Semiconductor Metal Oxide Semiconductor, n channel metal oxide semiconductor field effect transistor) switch T1,
Slow capacitor C 1, first resistance R 1 and second resistance R 2 of starting;
Described nmos switch T1 is serially connected on the negative supply;
Described first resistance R 1 and second resistance R 2 are serially connected, the control end of the described nmos switch T1 of public termination, another termination negative supply of first resistance R 1, the other end ground connection of second resistance R 2;
Described slow startup capacitor C 1 is connected between the control end and input of nmos switch T1, also is between the grid and source electrode of NMOS.
When negative supply powered on, the slow electric capacity both end voltage Vc that starts slowly rose, as Vc during greater than the threshold voltage vt of NMOS, and nmos switch T1 closure.
When negative supply was stablized, the voltage of first resistance R 1 and second resistance R, 2 common ports had determined the voltage of nmos switch T1 control end.
In embodiment two, during the negative supply power down, because the slow electric capacity both end voltage that starts can not be suddenlyd change, nmos switch T1 still is in closure state, so negative supply output may cause the working state abnormal of subordinate equipment, and the capacitance charge bleed off is when incomplete, if negative supply powers on very soon, soft start function lost efficacy, and surge current causes the damage and the fault of back Circuits System easily like this.
In order to make the slow electric capacity that starts can repid discharge, relaxed starter described in the utility model also comprises: relay, ADC and MCU;
Described relay, in parallel with described slow startup electric capacity;
Described ADC is used for the analogue value of power supply is converted to digital value, and transformation result is sent into described MCU;
Described MCU is used to detect the digital value of described power supply, when the digital value of described power supply is lower than threshold value, controls described relay closes, when the digital value of described power supply is higher than threshold value, controls described relay and disconnects.
MCU has the characteristics of digitlization and intelligence, and this threshold value can be by the setting of software flexible, and MCU adopts independently power supply power supply, not influenced by the negative supply power or power-down, but operate as normal.
When the negative supply power down, when the absolute value of voltage difference that MCU detects negative supply and ground is lower than threshold value, control described relay closes, slow startup electric capacity shorted on both ends together, the slow electric charge that starts on the electric capacity can be fallen by quick bleed off, if think that the short circuit meeting causes electric current excessive, can on the bleed off loop, place a current-limiting resistance.
When negative supply powers on, when the absolute value of voltage difference that MCU detects negative supply and ground is higher than threshold value, controls described relay and disconnect, the slow voltage difference that starts on the electric capacity just can slowly rise, and nmos switch T1 is conducting gradually.When the starting stage of power supply electrifying, to be negative supply with the absolute value of the voltage difference on ground be lower than threshold value, the low relay of supply voltage can be closed always, the slow electric capacity that starts is in short-circuit condition always, and nmos switch T1 can conducting, can prevent that so less voltage is delivered to power supply output.
Embodiment three
Referring to Fig. 3, input is a positive supply, relaxed starter comprises in the prior art: PMOS switch T1, slow capacitor C 1, NPN-BJT (NPN-Bipolar Junction Transistor, bipolar npn junction transistor) switch T2, first resistance R 1, second resistance R 2, the 3rd resistance R 3 and the 4th resistance R 4 of starting;
Described PMOS switch is serially connected on the positive supply;
Described first resistance R 1, second resistance R 2 and NPN-BJT switch T2, order is serially connected the control end of the described PMOS switch of the public termination T1 of resistance, another termination positive supply of first resistance R 1, the output head grounding of NPN-BJT switch T2;
Described the 3rd resistance R 3 and the 4th resistance R 4 are serially connected, and common port B connects the control end of described NPN-BJTA switch T2, another termination positive supply of the 3rd resistance R 3, the other end ground connection of the 4th resistance R 4;
Described slow startup capacitor C 1, in parallel with described the 4th resistance R 4.
When positive supply powers on, the slow capacitor C 1 both end voltage Vc that starts slowly rises, as Vc during greater than the threshold voltage vt of NPN-BJT switch T2, and NPN-BJT switch T2 closure, the common port voltage of first resistance R 1 and second resistance R 2 descends gradually, control PMOS switch T1 closure.
When positive supply was stablized, the voltage of first resistance R 1 and second resistance R, 2 common ports had determined the voltage of PMOS switch T1 control end.
In embodiment three, during the positive supply power down, because slow capacitor C 1 both end voltage that starts can not be suddenlyd change, NPN-BJT switch T2 still is in closure state, cause PMOS switch T1 also to be in closure state, so when the capacitance charge bleed off is incomplete, if positive supply powers on very soon always, soft start function lost efficacy, and surge current causes the damage and the fault of back Circuits System easily like this.
In order to make the slow capacitor C 1 that starts can repid discharge, relaxed starter described in the utility model also comprises: PNP-BJT (PNP-Bipolar Junction Transistor, positive-negative-positive bipolar junction transistor) switch T3, the 5th resistance R 5 and the 6th resistance R 6;
Described PNP-BJT switch T3, in parallel with described slow startup capacitor C 1;
Described the 5th resistance R 5 and the 6th resistance R 6 are serially connected, and common port A connects the control end of described PNP-BJT switch T3, another termination power of the 5th resistance R 5, the other end ground connection of the 6th resistance R 6.
R5=R3 is set, R6=R4, when the positive supply steady operation, A, B point voltage equate that T3 disconnects, and does not influence powering on and operate as normal of relaxed starter.
When the positive supply power down, the A point voltage drops to 0 rapidly, and the B point voltage also is in the value before the power down, and the pressure reduction that A, B orders makes the T3 closure, the C1 shorted on both ends together, the electric charge on the C1 can be fallen by bleed off fast, makes T2 disconnect, the T1 disconnection.
When positive supply powered on, A, B point voltage equated that T3 disconnects, and the voltage difference at C1 two ends just can slowly rise, and the T2 closure makes the T1 closure, and positive supply is normally exported.
Embodiment four
Referring to Fig. 4, input is a negative supply, and relaxed starter comprises in the prior art: nmos switch T1, slow capacitor C 1, first resistance R 1 and second resistance R 2 of starting;
Described nmos switch T1 is serially connected on the negative supply;
Described first resistance R 1 and second resistance R 2 are serially connected, and the common port B of resistance connects the control end of described nmos switch T1, the other end ground connection of first resistance R 1, another termination negative supply of second resistance R 2;
Described slow startup capacitor C 1, in parallel with described second resistance R 2.
When negative supply powered on, the slow capacitor C 1 both end voltage Vc that starts slowly rose, as Vc during greater than the threshold voltage vt of nmos switch T1, and nmos switch T1 closure.
When negative supply was stablized, the voltage of first resistance R 1 and second resistance R, 2 common port B had determined the voltage of nmos switch T1 control end.
In embodiment four, during the negative supply power down, because slow capacitor C 1 both end voltage that starts can not be suddenlyd change, nmos switch T1 also is in closure state always, so when the capacitance charge bleed off is incomplete, if negative supply powers on very soon, soft start function lost efficacy, and surge current causes the damage and the fault of back Circuits System easily like this.
In order to make the slow capacitor C 1 that starts can repid discharge, relaxed starter described in the utility model also comprises: PNP-BJT switch T2, the 3rd resistance R 3 and the 4th resistance R 4;
Described PNP-BJT switch T2, in parallel with described slow startup capacitor C 1;
Described the 3rd resistance R 3 and the 4th resistance R 4 are serially connected, and common port A connects the control end of described PNP-BJT switch T2, the other end ground connection of the 3rd resistance R 3, another termination negative supply of the 4th resistance R 4.
When the negative supply power down, the A point voltage drops to 0 rapidly, and the B point voltage also is in the value before the power down, and the pressure reduction that A, B orders makes the T2 closure, the C1 shorted on both ends together, the electric charge on the C1 can be fallen by bleed off fast, makes the T1 disconnection.
When negative supply powers on, R3=R1 is set, R4=R2, A, B point voltage equate that T2 disconnects, and the voltage difference at C1 two ends just can slowly rise, and makes the T1 closure, and negative supply is normally exported.
More than among four embodiment, the switch of the switch of described NPN-BJT type and NMOS type is interchangeable; The switch of the switch of described PNP-BJT type and PMOS type is interchangeable, and the type of switch is not limited to the description among the embodiment.
The utility model adopts the bleed off loop that constitutes electric capacity at a slow startup electric capacity two ends switch in parallel, and during power supply power-fail, the control switch closure is released the electric charge on the electric capacity rapidly; But when institute adds switch and will guarantee power supply electrifying or stable power-supplying simultaneously, be in the state of disconnection, not influence charging normal of electric capacity.
Claims (8)
1. the relaxed starter of a DC power supply comprises: delay startup electric capacity, it is characterized in that described relaxed starter also comprises: the power interruption recovering module;
Described power interruption recovering module comprises switch and ON-OFF control circuit;
Described switch is in parallel with described slow startup electric capacity;
Described ON-OFF control circuit is used to detect power supply, when the value of described power supply is lower than threshold value, controls described switch closure, when the value of described power supply is higher than threshold value, controls described switch and disconnects.
2. relaxed starter according to claim 1 is characterized in that described switch is a relay; Described ON-OFF control circuit comprises ADC and MCU;
Described ADC is used for the analogue value of power supply is converted to digital value, and transformation result is sent into described MCU;
Described MCU is used to detect the digital value of described power supply, when the digital value of described power supply is lower than threshold value, controls described relay closes, when the digital value of described power supply is higher than threshold value, controls described relay and disconnects.
3. as relaxed starter as described in the claim 2, it is characterized in that described power supply is a positive supply;
Described relaxed starter also comprises: PMOS switch, first resistance and second resistance;
Described PMOS switch is serially connected on the positive supply;
Described first resistance and second resistance are serially connected, the control end of the described PMOS switch of public termination, another termination positive supply of first resistance, the other end ground connection of second resistance;
Described slow startup electric capacity is connected between the control end and input of PMOS switch.
4. as relaxed starter as described in the claim 2, it is characterized in that described power supply is a negative supply;
Described relaxed starter also comprises: nmos switch, first resistance and second resistance;
Described nmos switch is serially connected on the negative supply;
Described first resistance and second resistance are serially connected, the control end of the described nmos switch of public termination, another termination negative supply of first resistance, the other end ground connection of second resistance;
Described slow startup electric capacity is connected between the control end and input of nmos switch.
5. relaxed starter according to claim 1 is characterized in that described switch is an analog switch; Described ON-OFF control circuit comprises first resistance and second resistance;
Described analog switch, in parallel with described slow startup electric capacity;
Described first resistance and second resistance are serially connected, the control end of the described analog switch of public termination, another termination power of first resistance, the other end ground connection of second resistance.
6. as relaxed starter as described in the claim 5, it is characterized in that described analog switch is the PNP-BJT switch.
7. as relaxed starter as described in the claim 6, it is characterized in that described power supply is a positive supply;
Described relaxed starter also comprises: PMOS switch, NPN-BJT switch, the 3rd resistance, the 4th resistance, the 5th resistance and the 6th resistance;
Described PMOS switch is serially connected on the positive supply;
Described the 3rd resistance, the 4th resistance and NPN-BJT switch, order is serially connected the control end of the described PMOS switch of public termination of resistance, another termination positive supply of the 3rd resistance, the output head grounding of NPN-BJT switch;
Described the 5th resistance and the 6th resistance are serially connected, the control end of the described NPN-BJT switch of public termination, another termination positive supply of the 5th resistance, the other end ground connection of the 6th resistance;
Described slow startup electric capacity, in parallel with described the 6th resistance.
8. as relaxed starter as described in the claim 6, it is characterized in that described power supply is a negative supply;
Described relaxed starter also comprises: nmos switch, the 3rd resistance and the 4th resistance;
Described nmos switch is serially connected on the negative supply;
Described the 3rd resistance and the 4th resistance are serially connected, the control end of the described nmos switch of public termination, another termination negative supply of the 3rd resistance, the other end ground connection of the 4th resistance;
Described slow startup electric capacity is connected between the control end and input of nmos switch.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201328041U CN201523320U (en) | 2009-06-09 | 2009-06-09 | Slow start device of direct current power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009201328041U CN201523320U (en) | 2009-06-09 | 2009-06-09 | Slow start device of direct current power supply |
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| CN201523320U true CN201523320U (en) | 2010-07-07 |
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| CN109215559A (en) * | 2018-10-26 | 2019-01-15 | 合肥鑫晟光电科技有限公司 | Drive control circuit, drive control method and display device |
| US11790821B2 (en) | 2018-10-26 | 2023-10-17 | Hefei Xinsheng Optoelectronics Technology Co., Ltd. | Driving control circuit for detecting power-down time period, driving control method, and display device |
| CN109245749A (en) * | 2018-12-05 | 2019-01-18 | 博为科技有限公司 | A kind of delay switch circuit of reactance voltage fluctuation |
| CN109245749B (en) * | 2018-12-05 | 2024-01-30 | 博为科技有限公司 | Voltage fluctuation resistant delay switch circuit |
| CN115912884A (en) * | 2022-10-26 | 2023-04-04 | 深圳迈格瑞能技术有限公司 | Soft start control circuit and method |
| CN115912884B (en) * | 2022-10-26 | 2024-05-28 | 深圳迈格瑞能技术有限公司 | Soft start control circuit and method |
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